initial buildroot for linux 5.15

package/rcw-smarc-sal28/Config.in

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+config BR2_PACKAGE_RCW_SMARC_SAL28
+	bool "rcw-smarc-sal28"
+	help
+	  The reset configuration word for the SMARC-sAL28 board. All
+	  available RCWs are copied into the images output directory.
+	  Additionally, you have to choose one default RCW which is
+	  used for booting the board.
+
+if BR2_PACKAGE_RCW_SMARC_SAL28
+config BR2_PACKAGE_RCW_SMARC_SAL28_BUILD_UPDATE_SCRIPT
+	bool "Build RCW u-boot update script"
+	select BR2_PACKAGE_HOST_UBOOT_TOOLS
+	help
+	  Build the RCW updater script which can be used in the
+	  bootloader to change the installed RCW during runtime. The
+	  update script is called update-rcw.img and will be copied
+	  to the output directory.
+
+config BR2_PACKAGE_RCW_SMARC_SAL28_BOOT_VARIANT
+	string "RCW variant for booting"
+	default "3-11_q"
+	help
+	  The suffix of the RCW filename without the ".bin" part.
+	  E.g.  setting this to "3-11_q" will use "sl28-3-11_q.bin".
+endif

package/rcw-smarc-sal28/rcw-smarc-sal28.hash

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+# locally computed
+sha256	8c1c3e26407141ee8d8bd16a43c16c0459b01a60e6e25ca47e22c7499b3e4e65  rcw-smarc-sal28-11.tar.gz
+sha256	803c65088eed36a6697ca9f03f4379bbad24e276dc8da7fef5eb4dc4008415a1  COPYING

package/rcw-smarc-sal28/rcw-smarc-sal28.mk

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+################################################################################
+#
+# rcw-smarc-sal28
+#
+################################################################################
+
+RCW_SMARC_SAL28_VERSION = 11
+RCW_SMARC_SAL28_SITE = $(call github,kontron,rcw-smarc-sal28,v$(RCW_SMARC_SAL28_VERSION))
+RCW_SMARC_SAL28_LICENSE = BSD-2-Clause
+RCW_SMARC_SAL28_LICENSE_FILES = COPYING
+RCW_SMARC_SAL28_INSTALL_TARGET = NO
+RCW_SMARC_SAL28_INSTALL_IMAGES = YES
+
+RCW_SMARC_SAL28_BOOT_VARIANT = $(call qstrip,$(BR2_PACKAGE_RCW_SMARC_SAL28_BOOT_VARIANT))
+
+ifeq ($(BR2_PACKAGE_RCW_SMARC_SAL28_BUILD_UPDATE_SCRIPT),y)
+RCW_SMARC_SAL28_DEPENDENCIES += host-uboot-tools
+define RCW_SMARC_SAL28_UPDATE_SCRIPT_BUILD_CMDS
+	MKIMAGE=$(HOST_DIR)/bin/mkimage $(MAKE) -C $(@D)/contrib all
+endef
+define RCW_SMARC_SAL28_UPDATE_SCRIPT_INSTALL_CMDS
+	$(INSTALL) -D -m 0644 $(@D)/contrib/update-rcw.img $(BINARIES_DIR)/
+endef
+endif
+
+define RCW_SMARC_SAL28_BUILD_CMDS
+	$(RCW_SMARC_SAL28_UPDATE_SCRIPT_BUILD_CMDS)
+endef
+
+define RCW_SMARC_SAL28_INSTALL_IMAGES_CMDS
+	$(INSTALL) -d $(BINARIES_DIR)/rcw
+	$(INSTALL) -D -m 0644 $(@D)/sl28-*.bin $(BINARIES_DIR)/rcw/
+	ln -sf rcw/sl28-$(RCW_SMARC_SAL28_BOOT_VARIANT).bin $(BINARIES_DIR)/rcw.bin
+	$(RCW_SMARC_SAL28_UPDATE_SCRIPT_INSTALL_CMDS)
+endef
+
+$(eval $(generic-package))